Kudos to Google for coming up with a search portal specifically designed for the blind and visually impaired! From Google's FAQ's (in nice large Font) for the product, which is still in BETA:
Accessible Search is an early Google Labs product designed to identify and prioritize search results that are more easily usable by blind and visually impaired users. Regular Google search helps you find a set of documents that is most relevant to your tasks. Accessible Search goes one step further by helping you find the most accessible pages in that result set.In Google's Blog, Research Scientist T.V. Ramen explains further:
…In its current version, Google Accessible Search looks at a number of signals by examining the HTML markup found on a web page. It tends to favor pages that degrade gracefully--that is, pages with few visual distractions, and pages that are likely to render well with images turned off. Google Accessible Search is built on Google Co-op's technology, which improves search results based on specialized interests.
There are a few forums discussing this groundbreaking product, Cre8asite Forums, WebMasterWorld, and Search Engine watch Forums all have good participation. please feel free to post further relevant links, especially any in forums that cater to the visually impaired community, in the comments.